The new TGTU section, covering SRU rows 3 and 4, is now fully operational. It is the only active TGTU in the South Pars region.
This achievement advances environmental protection and sustainable development. The team at Neyr Perse led the effort.
After completing pre-startup preparations and receiving the Ready-for-Commissioning (RFC) certificate, the team performed successful curing of the Mixing Chamber and catalyst loading. Following that, they secured the PSSER safety and environmental certificate and the Ready-for-Start-Up (RFSU) technical clearance. These steps cleared the path for the final startup.
Optimizations were made in the fuel lines and gas lance inlets. This allowed carefully controlled preheating of the reactor to activate the Co-Mo catalyst using H₂S gas—a process known as sulfidation. The pilot’s burner management system (BMS) logic was started, and the furnace was brought into service.
With catalysts active and control systems calibrated, the team monitored hydrogen levels via an online analyzer. Operating under sub-stoichiometric conditions and using steam, they generated reducing gases at optimal rates. The Mixing Chamber was then prepared to receive tail gas from the Claus section and off-gas from the Acid Gas Enrichment (AGE) tower.
Because the actual H₂S content differed from initial design studies, Neyr Perse experts reconfigured the process and control parameters. This prevented total sulfur from escaping toward the amine tower.
When the reactor began processing tail gas, the team controlled furnace temperature spikes and excess hydrogen. After cooling in the Cooling Column, the reactor’s H₂S output was directed to the TGTU absorption tower and returned into the amine loop. Despite many challenges, the TGTU section started successfully and entered normal operation.
Neyr Perse collaborated with the project owner, Pars Oil and Gas Company, and contractor partners, including Exir Sanat, POMC, and Petro Arvin. Earlier, in February 2025, Neyr Perse had achieved approximately 95% recovery of acid gases in the Claus section of the SRU. Now, the remaining acid gases directed to Phase 14’s flares are being recovered—fulfilling contractual obligations and supporting green operations, environmental protection, and social responsibility.